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Burning my coil.

buffblazer

buffblazer

1/2 ton status
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On my 86 k5 I pulled the 350 to re seal it.

Installed it and dropped in the dizzy. Now on the coil I have the hot wire that is red on the very end if the coil.

Then the three wire connector behind that which is ( from the front of truck to rear) Brown black red

Same set up every other time I have screwed with it. Only now I have MSD dizzy with box installed by a shop while I was out of town.

After I connected everything I had no spark. I then noticed with the key off I have no power to the red wire which is normal but the coil Is super hot. After 2 hours of fiddling with it I noticed smoke coming off the coil wires.

Disconnect to save a fire but now scratching my head.

Why no spark and why it smoking?

a6cd8cd1-d51f-f80f.jpg


a6cd8cd1-d54f-1e05.jpg


a6cd8cd1-d576-7ca7.jpg


Also in the 3rd pic that red wire with the blade connector was added when the dizzy and box was installed. I for the life of me have no clue where it goes. No power to it with the key on or off
 
Sorry, I'm no help but Philly87 works at MSD. I'd suggest modifying your title and hopefully he'll see it. ;)
 
Could you describe your engine grounds.

SHOULD have
Ground from engine to body
Ground from engine to battery
Ground from battery from body

I like to add a frame to engine ground and a Battery to frame also
 
I have 2 grounds from engine to body. Large cable from battery to engine, 2 small wires from battery to body and wire from dizzy to intake
 
Even the cruddy chiltons manual has a wiring diagram for those HEI ignitions. grab that and the diagram for the MSD box. See what you can make.
 
Did you put the metal ground strap ON the coil itself??..a bent twisted looking metal thingy that held on by one of the coil mounting screws..seen them get left off and then problems like this happen...the red wire may have been for a tachometer or a kill switch maybe?...
 
diesel4me said:
Did you put the metal ground strap ON the coil itself??..a bent twisted looking metal thingy that held on by one of the coil mounting screws..seen them get left off and then problems like this happen...the red wire may have been for a tachometer or a kill switch maybe?...
Click to expand...


They are not always the metal type, i've seen just a black wire that goes under the coil mounting screw.
 
buffblazer said:
Only now I have MSD dizzy with box installed by a shop while I was out of town.
Click to expand...


If you have an MSD CD box such as a 6A or 6AL you SHOULD NOT supply the coil with 12 volts. The only wires that need to touch the coil are the orange and black of the MSD box and the ground... See diagram below. If you don't have a box let me know and we'll go from there.

Keep in mind this is no longer an inductive ignition anymore; if an MSD box is installed this is a capacitive discharge ignition. This means that you only supply voltage to the box which charges the capacitor inside the box. Once the box gets the signal to fire then it fires about 480 or so volts to the coil depending on which box you have.

Check out the diagram and let me know if this helps.


HEI to MSD Box.jpg
 
diesel4me said:
Did you put the metal ground strap ON the coil itself??..a bent twisted looking metal thingy that held on by one of the coil mounting screws..seen them get left off and then problems like this happen...the red wire may have been for a tachometer or a kill switch maybe?...
Click to expand...

No never took that apart just the bolt to the intake was what was unhook

Now i could believe that the red wire is to a kill switch cause I do have one. And I vaguely remember it being stuffed up into one of those pins I just can't seem to remember which one, I tried direct power to it and it didn't change anything.

Even if I find where that wire goes. What would cause my coil to get super heated even with key off?
 
My main concern at this point is that he didn't hurt the coil of the box since 12V was applied. We'll cross our fingers.


If one of the parts is hurt I may know someone that can help him out though... :rolleyes:

Now the waiting game. :popcorn:
 
Houston we have ignition

Hooked the 12v key on Wire into the spade connector and she fired right up.

If she is running smoothly I most likely did not damage the coil or box right?
 
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